/*
 * Copyright 2010 - Jeremie Brebec
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.jb.room.server;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

import com.google.inject.Inject;
import com.google.inject.Singleton;

@Singleton
public class RoomFilter implements Filter {

	/*
	 * 
	 */
	@Inject
	public RoomFilter( RoomScope scope ) {
		this.scope = scope;
	}
	
	/*
	 * (non-Javadoc)
	 * @see javax.servlet.Filter#destroy()
	 */
	@Override
	public void destroy() {}

	/*
	 * (non-Javadoc)
	 * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)
	 */
	@Override
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		
		String room = null;
		
		if (request instanceof HttpServletRequest) {
			HttpServletRequest req = (HttpServletRequest)request;
			
			Object oroom = req.getHeader("X-Room");
			if (oroom != null)
				room = oroom.toString();
		}
		
		try {
			scope.setRoom( room );
			
			chain.doFilter(request, response);	
		}
		finally {
			scope.setRoom( null );
		}
	}

	/*
	 * (non-Javadoc)
	 * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
	 */
	@Override
	public void init(FilterConfig filterConfig) throws ServletException {}

	private final RoomScope scope;
}
